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cellophane |
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cellophane, thin, transparent sheet or tube of regenerated cellulose cellulose, chief constituent of the cell walls of plants. Chemically, it is a carbohydrate that is a high molecular weight polysaccharide. Raw cotton is composed of 91% pure cellulose; other important natural sources are flax, hemp, jute, straw, and wood. ..... Click the link for more information. . Cellophane is used in packaging and as a membrane for dialysis dialysis (dīăl`ĭsĭs), in chemistry, transfer of solute (dissolved solids) across a semipermeable membrane. ..... Click the link for more information. . It is sometimes dyed and can be moisture-proofed by a thin coating of pyroxylin pyroxylin (pīrŏk`sĭlĭn), partially nitrated cellulose (see nitrocellulose ). ..... Click the link for more information. . There are several steps in the preparation of cellophane from raw cellulose. The cellulose is first treated with an alkali, e.g., sodium hydroxide, and mixed with carbon disulfide to form viscose (see viscose process viscose process (vĭs`kōs), method widely used for the commercial preparation of rayon . ..... Click the link for more information. ). The viscose is aged for several days and then forced through a straight or circular slit into a dilute acid solution. The dissolved cellulose precipitates, and this regenerated cellulose has a lower molecular weight and a less orderly structure than the cellulose from which it is formed. cellophane [′sel·ə‚fān] (materials) A thin, transparent sheeting of regenerated cellulose; it is moisture-proof, and sometimes dyed, and used chiefly as food wrapping or as bags for dialysis. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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These low-odor resins are said to bond oriented PP, PET, and nylons, as well as PE, metallized and printed plastics, cellophane, aluminum foils, paper, and fiberboard. 50), journals and notecards, which come in packs of six wrapped in biodegradable cellophane ($7. It would seem, however, that those in the know are more clear about which end is which, demonstrated by the decision to pin this uncomfortable cellophane nappy around the backside of the building; placed beneath what some apparently consider to be its stumpy and inadequate tail. |
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